Question 391Electricity & Electronics - QMED

The correct answer is A) Source current is 12.5 amps, transformer current is 37.5 amps. This is correct because in a transformer with a unity power factor load, the source current will be the load current divided by the turns ratio of the transformer. With a 440 VAC supply and a 50 amp load, the source current is 50 amps divided by the turns ratio, which is 4:1. This results in a source current of 12.5 amps. The transformer current will be the load current, which is 50 amps, multiplied by the turns ratio, which is 4:1. This results in a transformer current of 37.5 amps. The other options are incorrect because they do not correctly apply the turns ratio to calculate the source and transformer currents.